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Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001# ==========================================================================
Denis Vlasenkoda8f43f2006-10-09 19:47:38 +00002# Build system
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00003# ==========================================================================
4
5BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
Denis Vlasenkodef88982007-10-07 17:06:01 +00006export BB_VER
Mike Frysinger5b5bcf22007-06-19 15:58:02 +00007SKIP_STRIP = n
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00008
Denis Vlasenkobf11e892006-11-26 22:17:46 +00009# -std=gnu99 needed for [U]LLONG_MAX on some systems
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +000010CPPFLAGS += $(call cc-option,-std=gnu99,)
Denis Vlasenko9dca07d2007-01-27 14:03:15 +000011
Denis Vlasenko7039a662006-10-08 17:54:47 +000012CPPFLAGS += \
13 -Iinclude -Ilibbb \
Denis Vlasenko4b04f542008-05-08 16:26:49 +000014 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include -I$(srctree)/libbb) \
Denis Vlasenko7039a662006-10-08 17:54:47 +000015 -include include/autoconf.h \
16 -D_GNU_SOURCE -DNDEBUG \
17 $(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \
Bernhard Reutner-Fischerfeea1b92006-12-06 21:51:59 +000018 -D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP
19
Denis Vlasenko55995022008-05-18 22:28:26 +000020CFLAGS += $(call cc-option,-Wall,)
21CFLAGS += $(call cc-option,-Wshadow,)
22CFLAGS += $(call cc-option,-Wwrite-strings,)
23CFLAGS += $(call cc-option,-Wundef,)
24CFLAGS += $(call cc-option,-Wstrict-prototypes,)
Denis Vlasenko68404f12008-03-17 09:00:54 +000025CFLAGS += $(call cc-option,-Wunused -Wunused-parameter,)
Denis Vlasenkoe2513372008-05-15 21:44:46 +000026CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
Denis Vlasenko55995022008-05-18 22:28:26 +000027# warn about C99 declaration after statement
28CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Denis Vlasenkoe2513372008-05-15 21:44:46 +000029# If you want to add more -Wsomething above, make sure that it is
30# still possible to build bbox without warnings.
Denis Vlasenkoc562bb72007-01-29 17:08:51 +000031
Denis Vlasenko4bb31892007-02-01 01:51:36 +000032ifeq ($(CONFIG_WERROR),y)
33CFLAGS += $(call cc-option,-Werror,)
34endif
Denis Vlasenkoc562bb72007-01-29 17:08:51 +000035# gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
36CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
37
Denis Vlasenkobd8390a2008-06-12 20:23:03 +000038CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
Denis Vlasenkoe0eebc12007-01-27 13:44:53 +000039# -fno-guess-branch-probability: prohibit pseudo-random guessing
Denis Vlasenko9dca07d2007-01-27 14:03:15 +000040# of branch probabilities (hopefully makes bloatcheck more stable):
41CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
42CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
Denis Vlasenkoe0eebc12007-01-27 13:44:53 +000043CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
Bernhard Reutner-Fischer82f87882007-01-23 11:39:13 +000044
Bernhard Reutner-Fischerfdcd7c42007-01-22 17:50:21 +000045# FIXME: These warnings are at least partially to be concerned about and should
46# be fixed..
Bernhard Reutner-Fischere6ce8242008-08-05 19:06:35 +000047#CFLAGS += $(call cc-option,-Wconversion,)
Bernhard Reutner-Fischer9729e652006-12-13 17:44:24 +000048
Denis Vlasenkobd8390a2008-06-12 20:23:03 +000049ifneq ($(CONFIG_DEBUG),y)
50CFLAGS += $(call cc-option,-Os,)
51else
52CFLAGS += $(call cc-option,-g,)
Bernhard Reutner-Fischere6ce8242008-08-05 19:06:35 +000053#CFLAGS += "-D_FORTIFY_SOURCE=2"
Denis Vlasenkobd8390a2008-06-12 20:23:03 +000054ifeq ($(CONFIG_DEBUG_PESSIMIZE),y)
55CFLAGS += $(call cc-option,-O0,)
56else
57CFLAGS += $(call cc-option,-Os,)
58endif
Bernhard Reutner-Fischer9729e652006-12-13 17:44:24 +000059endif
60
Denis Vlasenko1da86d22008-06-04 11:28:24 +000061# If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
62ARCH_FPIC ?= -fpic
63ARCH_FPIE ?= -fpie
64ARCH_PIE ?= -pie
65
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +000066ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
Denis Vlasenko8d82cf72007-10-11 10:02:52 +000067# on i386: 14% smaller libbusybox.so
68# (code itself is 9% bigger, we save on relocs/PLT/GOT)
Denis Vlasenko1da86d22008-06-04 11:28:24 +000069CFLAGS += $(ARCH_FPIC)
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +000070# and another 4% reduction of libbusybox.so:
71# (external entry points must be marked EXTERNALLY_VISIBLE)
72CFLAGS += $(call cc-option,-fvisibility=hidden)
Denis Vlasenko8d82cf72007-10-11 10:02:52 +000073endif
74
Bernhard Reutner-Fischerc1feac62007-01-08 16:29:15 +000075ifeq ($(CONFIG_STATIC),y)
Denis Vlasenko1da86d22008-06-04 11:28:24 +000076CFLAGS_busybox += -static
77endif
78
79ifeq ($(CONFIG_PIE),y)
80CFLAGS_busybox += $(ARCH_PIE)
81CFLAGS += $(ARCH_FPIE)
Bernhard Reutner-Fischerc1feac62007-01-08 16:29:15 +000082endif
Denis Vlasenkod46d3c22007-02-06 19:28:50 +000083
Bernhard Reutner-Fischerf6107c72009-01-22 13:27:14 +000084ifneq ($(CONFIG_EXTRA_CFLAGS),)
85CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS)))
86#"))
87endif
88
Denis Vlasenkodef88982007-10-07 17:06:01 +000089LDLIBS += m crypt
Denis Vlasenkod6e81c72007-08-21 10:58:18 +000090
91ifeq ($(CONFIG_PAM),y)
Denis Vlasenko76a6b232007-10-07 17:05:42 +000092LDLIBS += pam pam_misc
Denis Vlasenkod6e81c72007-08-21 10:58:18 +000093endif
94
Denis Vlasenkod46d3c22007-02-06 19:28:50 +000095ifeq ($(CONFIG_SELINUX),y)
Denis Vlasenko76a6b232007-10-07 17:05:42 +000096LDLIBS += selinux sepol
Denis Vlasenkod46d3c22007-02-06 19:28:50 +000097endif
Bernhard Reutner-Fischer58a275b2007-03-28 15:00:27 +000098
99ifeq ($(CONFIG_EFENCE),y)
Denis Vlasenko76a6b232007-10-07 17:05:42 +0000100LDLIBS += efence
Bernhard Reutner-Fischer58a275b2007-03-28 15:00:27 +0000101endif
102
103ifeq ($(CONFIG_DMALLOC),y)
Denis Vlasenko76a6b232007-10-07 17:05:42 +0000104LDLIBS += dmalloc
Bernhard Reutner-Fischer58a275b2007-03-28 15:00:27 +0000105endif
106
Denis Vlasenko401de642008-06-06 16:11:12 +0000107# If a flat binary should be built, CFLAGS_busybox="-Wl,-elf2flt"
108# env var should be set for make invocation.
109# Here we check whether CFLAGS_busybox indeed contains that flag.
110# (For historical reasons, we also check LDFLAGS, which doesn't
111# seem to be entirely correct variable to put "-Wl,-elf2flt" into).
112W_ELF2FLT = -Wl,-elf2flt
113ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox)))
Mike Frysinger5b5bcf22007-06-19 15:58:02 +0000114SKIP_STRIP = y
115endif
116
Mike Frysingerc7b10dc2007-04-05 21:10:59 +0000117# Busybox is a stack-fatty so make sure we increase default size
Denis Vlasenko931de892007-06-21 12:43:45 +0000118# TODO: use "make stksizes" to find & fix big stack users
119# (we stole scripts/checkstack.pl from the kernel... thanks guys!)
Denis Vlasenkofcfb5c02007-12-24 12:16:24 +0000120# Reduced from 20k to 16k in 1.9.0.
121FLTFLAGS += -s 16000